242 



Professor R. Collett has in the stated place given a de- 

 tailed and careful description of this Cottoid. I shall how- 

 ever add some remarks about some peculiarities which Collett 

 does not mention, probably because the specimens at his disposal 

 were too young to show them in their full development^). 



It is well known that in Cottoids the difference of sex will 

 often show itself in the exterior of the fish, now in one way, 

 now in another, or at the same time in several ways (compare 

 Lütken, Vidensk. Medd. Naturh. Foren. Kbhvn. 1876, p. 387). 

 In Artediellus uncinatus I have observed a hitherto unknown 

 form for secondary difference of sex-). When I examined the 

 numerous specimens which were brought home by the Ingolf- 

 expedition from a trawling in Davis Strait, it caught my atten- 

 tion that while nothing unusual was to be observed in the 

 foremost dorsal fin of some specimens, this fin was in other 

 specimens very high . By the dissection of several specimens 

 1 was convinced that the specimens with the high dorsal 

 fin are males, those with the low one females. The smaller 

 the specimens are the less is the difference, but yet it is still 

 perceptible in specimens of 57 mm. Also second dorsal fin is 

 higher in the males than in the females, but the difference is 

 not so conspicuous in large specimens as it is with regard to 

 the foremost dorsal fin. The anal fin is about equally high in 

 both sexes. The two figures in plate XII will illustrate the 

 difference of sex between the largest male (fig. 2 a) and female 

 (fig. 2 b) from the «station» in question. For special comparison 

 I give the following measurements: 



M It is however remarkable that these circumstances have not been men- 

 tioned by other ^^ riters who have had adult specimens for examination. 

 From West-Greenland there has f. i. been specimens of up to 100 mm., 

 from the Barents Sea even up to 112 mm. 



') [Later addition]. Compare however the description of Artediellus paci- 

 ficus Gilb, in Jordan & Evermann: Fishes of North-America, II, 

 1898, p. 1907. 



